An undated family photo of Lisa Irwin, now 10-months-old and reported missing, is shown at a news conference in Kansas City, Mo., Wednesday, Oct. 5, 2011. (AP Photo/Family Photo via The Kansas City Star)

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Decades of statistics on infant abductions in the U.S. suggest one of the least likely scenarios in this week's disappearance of a Kansas City baby is that a stranger broke into her home and quietly snatched her from her crib.